It depend a lot on the kind of fishing operation. At small scale the fishing gear is a large part of the investment. This is why repairing nets is a large part of those peoples time. Tracking is a nice technological solution, through at small scale the money is tight and local knowledge usually mean that they know where the net is by memory/intuition and keeping track of where the winds/currents are going.
Large scale fishing fleet however do not generally repair fishing nets, especially trawlers. It not economical to spent time and manpower for it, and since they are out at sea for weeks/months there isn't any space. The law require them to dispose broken nets at landfills but that is a cost center. As such it is suspected is that they just intentionally throw the nets over board.
> The law require them to dispose broken nets at landfills but that is a cost center.
You could fix that by moving the cost. Make nets really expensive to purchase, and instead give a deposit back at the landfill. This way, there would be a profit in properly disposing of nets.
Of course, it might not be practical to suddenly have to watch for contraband smuggled nets at the borders.
Large scale fishing fleet however do not generally repair fishing nets, especially trawlers. It not economical to spent time and manpower for it, and since they are out at sea for weeks/months there isn't any space. The law require them to dispose broken nets at landfills but that is a cost center. As such it is suspected is that they just intentionally throw the nets over board.